Parameters are used for input of scalar values and for requesting special features. Parameters can be specified in the Case Control and the Bulk Data Sections of the Model Input File.
| Parameter | Description | Type | Default |
|---|---|---|---|
| ALPHA | Rayleigh damping mass matrix scale factor. | Real | 0.0 |
| AUTOMASSSCALE | The AUTOMASSSCALE parameter sets a minimum time step. The use of this parameter results in the mass of elements with very small time steps being scaled in order to increase their time step. To best use this parameter, first run a data check of your problem to get the average element time step information and minimum time step information for each element block. Set a minimum time with AUTOMASSSCALE so that the minimum times are raised closer to the average. Use this option carefully as it adds mass to the model. This parameter is mutually exclusive with AMSPERCENT. | Real | -1.0 |
| AMSPERCENT | Sets the value of the maximum allowable percent increase in mass of any of the parts in the model. The application will determine the minimum stable time step corresponding to his mass increase and scale all elements in the part up to this limit. Only one part will actually get scaled to the limit and any other parts will be scaled up to the minimum time step of the part that governs. This parameter is mutually exclusive with AUTOMASSCALE. | Real > 0 | 0.0 |
| AUTOQS | Specify that the solution procedure is to use the automatic quasi-static option. In this case the duration of the procedure defined on the TSTEPNL command by DT*NDT becomes a pseudo time. For each step in the procedure, the application will output results according to the NO parameter on the TSTEPNL command for the procedure. | ON/OFF | OFF |
| AUTOQSNUMSTEPS | Specify the number of steps to use to solve an automatic quasi-static procedure. If all the loads are applied in a single linear ramp, only one step is needed. If the amplitude functions that define the loading are not linear, enough step should be taken to follow the variation in the loading. Use the minimum number of steps possible to keep the computational run time down. | Integer > 0 | 1 |
| AMSEXTREMELIM | Sets the value of the ratio of average stability limit for a part to the part’s minimum stability limit. This parameter allows the application to perform automatic mass scalin to the extremely small elements in an part. Most often used with tet meshes that have tiny slivers in them. The percent mass scaling applied to parts with extreme range is set by the AMSEXTREMEPERCENT parameter. | Real > 1 | 5.0 |
| AMSEXTREMEPERCENT | Sets the allowable mass percent scaling value for the parts that have extreme ranges in their courant stability limits. | Real > 0 | 1.0 |
| BETA | Rayleigh damping stiffness matrix scale factor. | Real | 0.0 |
| BSCREATE | Create a BSSEG surface from the free surface of the elements identified by a property ID. | Integer | None |
| HEARTBEAT | Set the interval (number of time steps) between writing a line of output. | Integer | 50 |
| HISTINT | Set the interval (number of times steps) between writing history data into the XYPLOTS. | Integer | Max of 1000 points or all time steps. |
| MAXADMAXIMUM | Set the maximum allowable value for the MAXAD value on BSCONP definitions. Because Autodesk Explicit normally sets this to an unacceptable value, Autodesk Explicit checks the value against its maximum allowable value. If you want to override the limits, use this parameter. | Real > 0 | 1.0 |
| MAXADMINIMUM | Set the maximum allowable value for the MAXAD value on BSCONP definitions. Because Autodesk Explicit normally sets this to an unacceptable value, Autodesk Explicit checks the value against its maximum allowable value. If you want to override the limits, use this parameter. | Real > 0 | 0.5 |
| NLCOMPPLYFAIL | Nonlinear composite Progressive Ply Failure Analysis (PPFA) option. When set to ON, composite plies that fail the user specified failure theory (FT field on the PCOMP Bulk Data entry) will be reduced in material stiffness based on reduction scale factors specified on the MAT1 and MAT8 Bulk Data entries. | ON/OFF | OFF |
| NUMDELETE | If an element is set to be deleted (because of some failure) criterion, the element is deleted over the number of time steps set by this parameter. The internal forces calculated by the element at the time of failure are reduced to zero over NUMDELETE time steps. | Integer | 20 |
| STRENGTHRATIO | Controls the output of the Tsai Strength Ratio, which is provided in place of Failure Index for composite element ply results output. When set to OFF, the standard NASTRAN Failure Index is output. When set to ON, the Tsai Strength Ratio is calculated. Strength Ratio is considered more useful than Failure Index because it indicates exactly how to change the applied loading to achieve optimal ply performance (strength ratio equal to 1.0). | ON/OFF | OFF |
| TIMEREDUCTION | Time step scale factor. Use to reduce the time step size computed automatically by the explicit dynamics stability considerations. | Real | 1.0 |
| UNITS | Defines the model units system for output labeling and report generation. The format is D-F-H-T where D is the distance specifier, F is the force specifier, H is the heat specifier, and T is the time specifier. The following options are permitted:
|
D-F-H-T | Undefined |
| W4 | Damping coefficient for use with PELAST option. | Real | 0.0 |